Respiratory Structures

5. The diaphragm is the primary, dome-shaped skeletal muscle that works with rib muscles to move air in and out of lungs
7. Contains the vocal cords, which contract and vibrate when you speak (“voice box”)
9. smaller air passageways that are subdivisions of the bronchi
11. primary organ of the respiratory system, responsible for swapping oxygen from the air into the bloodstream and exhaling carbon dioxide waste

1. air-filled, mucosa-lined channels within the nose (separated by the septum) that act as the primary entrance to the respiratory system
2. Carries air to the lungs (the windpipe), supported by rings of cartilage
3. large airways of the lower respiratory tract, branching from the trachea (windpipe) into the lungs to conduct air to and from the lungs.
4. A thin, fluid-filled membrane that surrounds the lungs
6. A flap of cartilage that lies behind the tongue that serves to close the opening to the trachea when a person swallows
8. commonly known as the throat, is a 4–5 inch, muscle-lined tube
10. Tiny air sacs at the end of the bronchioles responsible for gas exchange